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【单选题】
( )证实中国是世界上最早种植水稻的国家A.
西安半坡遗址
B.
周口店北京人遗址
C.
云南元谋人遗址
D.
辽宁金牛山遗址
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反馈参考答案：
举一反三
【简答题】回溯法在包含问题的所有可能解的解空间树中,从根节点出发,按照____的策略进行搜索。
【单选题】In theory, this sounds like a good idea; however, I doubt that it will work ________.
A.
in practice
B.
in person
C.
in part
D.
in advance
【简答题】In theory, this sounds like a good idea; however, I doubt that it will work ________.
【单选题】An awful crash between an express train and a bus _____ , however, occur the other day in Russia
A.
15. An awful crash between an express train and a bus _____ , however, occur the other day in Russia. A. does
B.
did D. has to D. had to
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